TCPDUMP help -- option question

okorkie · 02-07-2012, 02:03 PM

Hello,

I have a question regarding TCPDUMP. I'm looking to run a TCPDUMP command with either of the following options:

- I want to capture x number of packets (somewhere between 1 to 10 packets)

or

- I want to capture for x number of seconds (I will want to capture for 1 second or less). Is it possible to capture for a time period of less than whole numbers (i.e. 0.5 seconds or 0.3 seconds, etc)?

Thanks in advance!

jhwilliams · 02-07-2012, 02:20 PM

You can always do something like this -- start a background process that sleeps for the desired time, then kill the dump.

Code:

tcpdump -A -i wlan0 &
pid=$?; sleep 3.25 && kill -9 $pid &